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EN 34
5.
Q528.1E LA
visible via the front LED. This is especially useful for fault
finding, when there is no picture.
When the blinking LED procedure is activated in the "on" state,
the front LED will show (blink) the contents of the error-buffer.
Error-codes > 10 are shown as follows:
1. "n" long blinks (where "n" = 1 - 9) indicating decimal digit,
2. A pause of 1.5 s,
3. "n" short blinks (where "n"= 1 - 9),
4. A pause of approx. 3 s,
5. When all the error-codes are displayed, the sequence
finishes with a LED blink of 3 s,
6. The sequence starts again.
Example: Error 12 8 6 0 0.
After activation of the SDM, the front LED will show:
1. 1 long blink of 750 ms (which is an indication of the decimal
digit) followed by a pause of 1.5 s,
2. 2 short blinks of 250 ms followed by a pause of 3 s,
3. 8 short blinks followed by a pause of 3 s,
4. 6 short blinks followed by a pause of 3 s,
5. 1 long blink of 3 s to finish the sequence,
6. The sequence starts again.
5.6.2
How to Activate
Use one of the following methods:
•
Activate the SDM or CSM. The blinking front LED will
show the entire contents of the error buffer (this works in
"normal operation" mode).
•
Transmit the commands "MUTE" - "062500" - "OK"
with a normal RC. The complete error buffer is shown.
Take notice that it takes some seconds before the blinking
LED starts.
•
Transmit the commands "MUTE" - "06250x" - "OK"
with a normal RC (where "x" is a number between 1 and
5). When x= 1 the last detected error is shown, x= 2 the
second last error, etc.... Take notice that it takes some
seconds before the blinking LED starts.
5.7
Protections
5.7.1
Software Protections
Most of the protections and errors use either the stand-by
microprocessor or the MIPS controller as detection device.
Since in these cases, checking of observers, polling of ADCs,
and filtering of input values are all heavily software based,
these protections are referred to as software protections.
There are several types of software related protections, solving
a variety of fault conditions:
•
Protections related to supplies: check of the 12V, +5V,
+1V2, +1V4, 2V5 and +3V3.
•
Protections related to breakdown of the safety check
mechanism. E.g. since the protection detections are done
by means of software, failing of the software will have to
initiate a protection mode since safety cannot be
guaranteed any more.
Remark on the Supply Errors
The detection of a supply dip or supply loss during the normal
playing of the set does not lead to a protection, but to a cold
reboot of the set. If the supply is still missing after the reboot,
the TV will go to protection.
Protections during Start-up
During TV start-up, some voltages and IC observers are
actively monitored to be able to optimise the start-up speed,
and to assure good operation of all components. If these
monitors do not respond in a defined way, this indicates a
malfunction of the system and leads to a protection. As the
observers are only used during start-up, they are described in
the start-up flow in detail (see paragraph "Stepwise Start-up").
Service Modes, Error Codes, and Fault Finding
5.7.2
5.8
5.8.1
5.8.2
5.8.3
5.8.4
Hardware Protections
The only real hardware protection in this chassis is (in case of
an audio problem) the audio protection circuit that will switch
"off" immediately the supply of the SSB. The supply will buzz
during the protection and +12VS drops to approx. 5V5 and +5V
Stand-by to approx. to 1V9. Other indication of the audio
protection is that the red LED lights up with an intensity of 50%.
Repair Tips
•
It is also possible that you have an audio DC protection
because of an interruption in one or both speakers (the DC
voltage that is still on the circuit cannot disappear through
the speakers). Caution: (dis)connecting the speaker wires
during the ON state of the TV at high volume can damage
the audio amplifier.
Fault Finding and Repair Tips
Read also paragraph "Error Codes" -> "Error Buffer" -> "Extra
Info".
Ambilight
Due to a degeneration process of the ambilights, it is
recommended to change both ambilight units in case one unit
needs to be repaired.
Audio Amplifier
It is recommended to replace all components at once (7D06,
7D09, 3D01, 3D25) when a defective FET 7D10 needs to be
fixed. For the left channel (defective FET 7D35) of the audio
amplifier replace all components like 7D31, 7D34, 3D11, 3D28.
CSM
When you activate CSM and there is a USB stick connected to
the TV, the software will dump the complete CSM content to the
USB stick. The file (Csm.txt) will be saved in the root of your
USB stick. If this mechanism works you can conclude that a
large part of the operating system is already working (MIPS,
USB...)
DC/DC Converter
Introduction
•
The best way to find a failure in the DC-DC converters is to
check their starting-up sequence at "power-on via the
mains cord", presuming that the standby microprocessor is
operational.
•
If the input voltage of DC-DC converters is around 12.7V
(measured on decoupling capacitors 2U03/2U93/2U6S
and 2U6R) and the enable signals are "low" (active) then
the output voltages should have their normal values. +12V
and +5V-POD supplies start-up first (enabled by POD-
MODE signal from the standby microprocessor). There is a
supplementary condition for +12V to start-up: if +5V-POD
does not start up due to a local defect, then +12V will not
be available as well. +5V-ON supply is enabled by the ON-
MODE signal (coming also from the standby
microprocessor) and is coming up a little bit later (20 ms)
due to the slower rise time needed to charge the USB
decoupling capacitor 2N31. +1V2 supply starts-up when
+12V appears, then at least 100 ms later, +1V8, +2V5 and
+3V3 will be activated via the ENABLE-3V3 signal from the
standby microprocessor. If +12V value is less than 10 V
then the last enumerated voltages will not show-up due to
the under-voltage detection circuit 6U10 + 7U10 and
surrounding components. Furthermore, if +12V is less than
8V then also +1V2 will not be available. The third DC-DC
convertor that delivers +1V4 out of +12V is started up when
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